How to Hide Backup and Staging by WP Time Capsule Admin Menus

function plt_hide_wp_time_capsule_menus() {
	//Hide "WP Time Capsule".
	remove_menu_page('wp-time-capsule-monitor');
	//Hide "WP Time Capsule → Backups".
	remove_submenu_page('wp-time-capsule-monitor', 'wp-time-capsule-monitor');
	//Hide "WP Time Capsule → Activity Log".
	remove_submenu_page('wp-time-capsule-monitor', 'wp-time-capsule-activity');
	//Hide "WP Time Capsule → Settings".
	remove_submenu_page('wp-time-capsule-monitor', 'wp-time-capsule-settings');
}

add_action('admin_menu', 'plt_hide_wp_time_capsule_menus', 11);

Where do I put this code?